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        var a = 3 > 5 && 3 < 5 && 7 == 4;  //false && true && false
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        var b = 3 > 5 || 3 < 5 || 7 == 4;  //false || true || false
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        var c = !a || 3 < 5 && 7 === 4;   //true || true && false
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